<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
   <style>
    .container{
        width: 500px;
        height: 500px;
        background-color: red;
        float: right;
    }
    .one{
        width: 200px;
        height: 200px;
        background-color: green;
      
    }
   </style>
</head>
<body>
    
    <div class="one"></div>
    <div class="container"></div>
</body>

</html>